More than a Brand. We're a Family.
A.Y. McDonald Mfg. Co. is a major manufacturer of water works valves and fittings, high-pressure gas valves, and residential and commercial water pumping systems. The Company has distinguished itself with a proud tradition of quality and reliability since its founding in 1856. A.Y. McDonald Mfg. Co. Corporate headquarters, brass foundry and main manufacturing plant are located in Dubuque, Iowa.